Can not mount DVD Media after burning.

Binary package hint: kernel-image-2.6.15-23-386-di

If I burn some files to blank DVD+R's using Gnome DVD Creator I can not mount the media upon completion. tail -f /var/log/messages gives the following error:

Aug 28 17:28:20 linux-laptop kernel: [4299663.918000] attempt to access beyond end of device
Aug 28 17:28:20 linux-laptop kernel: [4299663.919000] hdc: rw=0, want=3778588, limit=4
Aug 28 17:28:20 linux-laptop kernel: [4299663.919000] attempt to access beyond end of device
Aug 28 17:28:20 linux-laptop kernel: [4299663.920000] hdc: rw=0, want=1252, limit=4
Aug 28 17:28:20 linux-laptop kernel: [4299663.920000] attempt to access beyond end of device
Aug 28 17:28:20 linux-laptop kernel: [4299663.921000] hdc: rw=0, want=1028, limit=4
Aug 28 17:28:20 linux-laptop kernel: [4299663.921000] UDF-fs: No partition found (1)
Aug 28 17:28:22 linux-laptop kernel: [4299665.611000] attempt to access beyond end of device
Aug 28 17:28:22 linux-laptop kernel: [4299665.612000] hdc: rw=0, want=68, limit=4
Aug 28 17:28:22 linux-laptop kernel: [4299665.612000] isofs_fill_super: bread failed, dev=hdc, iso_blknum=16, block=16

Is this a kernel problem or is my hardware broken. DVD drive is an HL-DT-ST DVD-RW GWA-40 in an HP Pavillion Laptop.

Update: The media is burning OK and can be read in other computers (Windows), but it seems Ubuntu 6.06 is not mounting writable/re-writable media once burnt (it recognises blank media). Media that I burnt whilst I had Suse 10.1 on my laptop won't read either. However it seems to recognise original media (magazine coverdiscs) and writable/re-writable media burnt in other computers. I think my DVD drive is kaput. I'll try and close this bug. Sorry for bothering you.

Many thanks, Martin.